C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/215, 400/560
C08G 63/91 (2006.01) C08G 63/20 (2006.01) C08G 64/18 (2006.01) C08L 67/00 (2006.01) C08L 69/00 (2006.01)
Patent
CA 2004774
END-CAPPING OF POLYARYLATE CARBOXYL ENDS BY USE OF DIARYL OR POLYARYL CARBONATES ABSTRACT OF THE DISCLOSURE A process for improving the stability of polyarylate resin by reducing the terminal carboxyl acid group concentration of the polyarylate resin, the process being comprised of melting a mixture of the polyarylate resin and an aromatic carbonate capping agent and reacting the mixture under heat and, if necessary, vacuum until the concentration of the terminal carboxyl acid groups is reduced to less than that of the polyarylate resin prior to end-capping. The process also results in a polyarylate resin with a decreased flammability rating when the aromatic carbonate capping agent is bromine substituted.
Gay Frank P.
Logullo Francis M.
Luise Robert R.
Mack Mark P.
E. I. Du Pont de Nemours And Company
Gay Frank P.
Logullo Francis M.
Luise Robert R.
Mack Mark P.
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